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Title: Implementing NLO DGLAP evolution in parton showers

Abstract

Here, we present a parton shower which implements the DGLAP evolution of parton densities and fragmentation functions at next-to-leading order precision up to effects stemming from local four-momentum conservation. The Monte-Carlo simulation is based on including next-to-leading order collinear splitting functions in an existing parton shower and combining their soft enhanced contributions with the corresponding terms at leading order. Soft double counting is avoided by matching to the soft eikonal. Example results from two independent realizations of the algorithm, implemented in the two event generation frameworks Pythia and Sherpa, illustrate the improved precision of the new formalism.

Authors:
ORCiD logo [1];  [2];  [3]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. Durham Univ., Durham (United Kingdom)
  3. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1407421
Report Number(s):
[SLAC-PUB-16965]
[Journal ID: ISSN 1029-8479; PII: 6851; TRN: US1703148]
Grant/Contract Number:  
[AC02-76SF00515]
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
[Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2017; Journal Issue: 10]; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Jets; QCD Phenomenology

Citation Formats

Hoche, Stefan, Krauss, Frank, and Prestel, Stefan. Implementing NLO DGLAP evolution in parton showers. United States: N. p., 2017. Web. doi:10.1007/JHEP10(2017)093.
Hoche, Stefan, Krauss, Frank, & Prestel, Stefan. Implementing NLO DGLAP evolution in parton showers. United States. doi:10.1007/JHEP10(2017)093.
Hoche, Stefan, Krauss, Frank, and Prestel, Stefan. Fri . "Implementing NLO DGLAP evolution in parton showers". United States. doi:10.1007/JHEP10(2017)093. https://www.osti.gov/servlets/purl/1407421.
@article{osti_1407421,
title = {Implementing NLO DGLAP evolution in parton showers},
author = {Hoche, Stefan and Krauss, Frank and Prestel, Stefan},
abstractNote = {Here, we present a parton shower which implements the DGLAP evolution of parton densities and fragmentation functions at next-to-leading order precision up to effects stemming from local four-momentum conservation. The Monte-Carlo simulation is based on including next-to-leading order collinear splitting functions in an existing parton shower and combining their soft enhanced contributions with the corresponding terms at leading order. Soft double counting is avoided by matching to the soft eikonal. Example results from two independent realizations of the algorithm, implemented in the two event generation frameworks Pythia and Sherpa, illustrate the improved precision of the new formalism.},
doi = {10.1007/JHEP10(2017)093},
journal = {Journal of High Energy Physics (Online)},
number = [10],
volume = [2017],
place = {United States},
year = {2017},
month = {10}
}

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Cited by: 12 works
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Works referenced in this record:

A critical appraisal of NLO+PS matching methods
journal, September 2012

  • Höche, Stefan; Krauss, Frank; Schönherr, Marek
  • Journal of High Energy Physics, Vol. 2012, Issue 9
  • DOI: 10.1007/JHEP09(2012)049

Evolution of parton densities beyond leading order
journal, November 1980


Quark fragmentation within an identified jet
journal, April 2010


Ariadne version 4 — A program for simulation of QDC cascades implementing the colour dipole model
journal, August 1992


Parton fragmentation within an identified jet at NNLL
journal, May 2011

  • Jain, Ambar; Procura, Massimiliano; Waalewijn, Wouter J.
  • Journal of High Energy Physics, Vol. 2011, Issue 5
  • DOI: 10.1007/JHEP05(2011)035

Merging H/W/Z + 0 and 1 jet at NLO with no merging scale: a path to parton shower + NNLO matching
journal, May 2013

  • Hamilton, Keith; Nason, Paolo; Oleari, Carlo
  • Journal of High Energy Physics, Vol. 2013, Issue 5
  • DOI: 10.1007/JHEP05(2013)082

Coherent parton showers with local recoils
journal, January 2011


QCD analyses and determinations of $\alpha_s$ in ${\rm e}^+{\rm e}^-$ annihilation at energies between 35 and 189 GeV
journal, October 2000

  • Pfeifenschneider et al., P.; Abbiendi et al., G.
  • The European Physical Journal C, Vol. 17, Issue 1
  • DOI: 10.1007/s100520000432

Antenna showers with hadronic initial states
journal, January 2013


On the dependence of QCD splitting functions on the choice of the evolution variable
journal, August 2016

  • Jadach, S.; Kusina, A.; Placzek, W.
  • Journal of High Energy Physics, Vol. 2016, Issue 8
  • DOI: 10.1007/JHEP08(2016)092

Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions
journal, December 2007


Fooling around with the Sudakov veto algorithm
journal, March 2013


QCD Matrix Elements + Parton Showers
journal, November 2001


Event generation with SHERPA 1.1
journal, February 2009


Merging multi-leg NLO matrix elements with parton showers
journal, March 2013


Initial-state showering based on colour dipoles connected to incoming parton lines
journal, July 2008


Transverse-momentum-ordered showers and interleaved multiple interactions
journal, February 2005


A model for parton showers in QCD
journal, June 1980


A model for initial state parton showers
journal, July 1985


A QCD model for jet fragmentation including soft gluon interference
journal, June 1984


The midpoint between dipole and parton showers
journal, September 2015


Controlling inclusive cross sections in parton shower + matrix element merging
journal, August 2013


Matching matrix elements and shower evolution for top-pair production in hadronic collisions
journal, January 2007

  • Mangano, Michelangelo L.; Moretti, Mauro; Piccinini, Fulvio
  • Journal of High Energy Physics, Vol. 2007, Issue 01
  • DOI: 10.1088/1126-6708/2007/01/013

Merging meets matching in MC@NLO
journal, December 2012

  • Frederix, Rikkert; Frixione, Stefano
  • Journal of High Energy Physics, Vol. 2012, Issue 12
  • DOI: 10.1007/JHEP12(2012)061

Improving NLO-parton shower matched simulations with higher order matrix elements
journal, June 2010


Antenna showers with one-loop matrix elements
journal, October 2013

  • Hartgring, L.; Laenen, E.; Skands, P.
  • Journal of High Energy Physics, Vol. 2013, Issue 10
  • DOI: 10.1007/JHEP10(2013)127

NLLjet: a Monte Carlo code for e+e- QCD jets including next-to-leading order terms
journal, April 1991


Simulation of QCD jets including soft gluon interference
journal, May 1984


QCD coherent branching and semi-inclusive processes at large χ
journal, February 1991


Correcting the Colour-Dipole Cascade Model with Fixed Order Matrix Elements
journal, May 2002


General-purpose event generators for LHC physics
journal, July 2011


Matrix Elements and Parton Showers in Hadronic Interactions
journal, August 2002


Two real parton contributions to non-singlet kernels for exclusive QCD DGLAP evolution
journal, August 2011

  • Jadach, S.; Kusina, A.; Skrzypek, M.
  • Journal of High Energy Physics, Vol. 2011, Issue 8
  • DOI: 10.1007/JHEP08(2011)012

Singlet parton densities beyond leading order
journal, December 1980


Drell–Yan production at small q T , transverse parton distributions and the collinear anomaly
journal, June 2011


Space- and time-like cut vertices in QCD beyond the leading order—The singlet sector
journal, January 1981


Dipole formulation of QCD cascades
journal, September 1988


Monte Carlo simulation of general hard processes with coherent QCD radiation
journal, December 1988


Subleading Nc improved parton showers
journal, July 2012


A parton shower algorithm based on Catani-Seymour dipole factorisation
journal, March 2008


Asymptotic freedom in parton language
journal, August 1977


The string effect and QCD coherence
journal, December 1985


Two-loop anomalous dimension in light-cone gauge with Mandelstam-Leibbrandt prescription
journal, May 1998


An introduction to PYTHIA 8.2
journal, June 2015

  • Sjöstrand, Torbjörn; Ask, Stefan; Christiansen, Jesper R.
  • Computer Physics Communications, Vol. 191
  • DOI: 10.1016/j.cpc.2015.01.024

Coherent parton showers versus matrix elements - implications of PETRA/PEP data
journal, February 1987


Unitarising matrix element + parton shower merging
journal, February 2013


Space and time like cut vertices in QCD beyond the leading order - non-singlet sector
journal, January 1981


QCD matrix elements and truncated showers
journal, May 2009


A comparative study of coherent and non-coherent parton shower evolution
journal, January 1987


QCD matrix elements + parton showers. The NLO case
journal, April 2013

  • Höche, Stefan; Krauss, Frank; Schönherr, Marek
  • Journal of High Energy Physics, Vol. 2013, Issue 4
  • DOI: 10.1007/JHEP04(2013)027

NNLOPS simulation of Higgs boson production
journal, October 2013

  • Hamilton, Keith; Nason, Paolo; Re, Emanuele
  • Journal of High Energy Physics, Vol. 2013, Issue 10
  • DOI: 10.1007/JHEP10(2013)222

New formalism for QCD parton showers
journal, December 2003


    Works referencing / citing this record:

    Collinear and TMD quark and gluon densities from parton branching solution of QCD evolution equations
    journal, January 2018

    • Hautmann, F.; Jung, H.; Lelek, A.
    • Journal of High Energy Physics, Vol. 2018, Issue 1
    • DOI: 10.1007/jhep01(2018)070

    Measurement of jet substructure observables in t t ¯ events from proton-proton collisions at s = 13 TeV
    journal, November 2018


    Collinear and TMD parton densities from fits to precision DIS measurements in the parton branching method
    journal, April 2019


    FCC Physics Opportunities: Future Circular Collider Conceptual Design Report Volume 1
    journal, June 2019


    Production of Z bosons in the parton branching method
    journal, October 2019

    • Bermudez Martinez, A.; Connor, P. L. S.; Dominguez Damiani, D.
    • Physical Review D, Vol. 100, Issue 7
    • DOI: 10.1103/physrevd.100.074027